the difference between two equal fractions is zero.
There is no difference in value between "equal" fractions: the difference is zero.
If two fractions are equal then the difference between them is zero (0).
Non-equivalent fractions are fractions that are not equal
Zero represents the difference between two equal anythings.
No, the relevant difference is 0.
Equivalent fractions are fractions that are equal. So, 1/2 and 2/4 are equivalent.